Surelight Ignition Control Troubleshooting Guide; Unit Fails To Operate In The Cooling, Heating, Or Continuous Fan Mode - Lennox G24M SERIES Unit Information

E--SureLight Ignition Control Troubleshooting Guide
UPON INITIAL POWER UP , REMOVE ALL THERMOSTAT DEMANDS TO THE UNIT
PROBLEM: 1 UNIT FAILS TO OPERATE IN THE COOLING, HEATING, OR CONTINUOUS FAN MODE
Condition
1.1
Both diagnostic lights fail to light
- -
up.
LED#1--Off
LED#2--Off
1.2
Diagnostic lights flash the roll--
- -
out code. out code.
LED#1 O LED#1--On,
LED#2 Slow Flash LED#2--Slow Flash
1.3
-- On initial power--up the comb. air
blower does not energize. blower does not energize.
-- Diagnostic lights flash the re-
verse polarity code.
LED#1--Fast Flash,
LED#2--Slow Flash.
1.4
-- On initial power up the combus-
tion air blower does not energize.
-- Diagnostic lights flash normal
power on operation power on operation.
LED#1--Slow Flash
LED#2--Slow Flash
Possible Cause
1.1.1
Main voltage 120V not supplied to
unit.
1.1.2
Miswiring of furnace or improper
connections.
1.1.3
Circuit breaker tripped or fails to
close.
1.1.4
Door interlock switch failure.
1.1.5
Transformer Failure.
1.1.6
Failed control board.
1.2.1
Roll--out switch open.
1.2.2
Roll--out switch failure.
1.2.3
Mis iring or improper connections Miswiring or improper connections
at roll--out switch.
1.2.4
Nine pin connector failure
1.3.1
120V main power polarity re-
versed. versed.
1.4.1
Open combustion air blower motor
circuit.
1.4.2
Failed combustion air blower mo-
tor.
3DJH 
Corrective Action / Comments
ACTION 1 - - Check 120V main voltage.
Determine cause of main power failure.
ACTION 1 - - Check for correct wiring of 120V
to power make up box and transformer.
ACTION 2 - - Check 24V wiring to control
board.
ACTION 1 - - Replace circuit breaker if it is re-
set but does not have continuity.
ACTION 2 - - If circuit breaker still trips, check
for short.
ACTION 1 - - Check that door switch is activated
when door is closed.
ACTION 2 - - Check wire connections to switch,
replace loose connectors.
ACTION 3 - - Check continuity of switch in
closed position. Replace if malfunctioning
ACTION 1 - - Check that transformer output is
24V. Replace if malfunctioning
ACTION 1 - - If all the above items have been
checked, replace board.
ACTION 1 - - Manually reset the roll- -out
switch by pushing the top button.
ACTION 2 - - Determine the cause of the roll- -
out switch activation before leaving furnace.
ACTION 1 - - Check continuity across roll- -out
switch. Replace roll- -out switch if switch is
reset but does not have continuity.
ACTION 1 ACTION 1 - - Check wiring connections to Check wiring connections to
switch.
ACTION 1 - - Check 9- -pin connector for prop-
er connection to control board.
ACTION 2 - - Check continuity of the multi
plug pin.
ACTION 1 - - Check the 120V has line and neu-
tral correctly input into control.
ACTION 2 - - Reverse the line and neutral at the
120V field connection. 120V field connection.
ACTION 1 - - Check for 120V to combustion air
blower. If no power, check wire and connec-
tions.
ACTION 1 - - If power is present at blower, re-
place blower.